import math num = 1000001 arr = [0]*50 i = -1 total = 0 while(num != 0): i += 1 arr[i] = num % 10 num = math.floor(num / 10) for j in range(i, -1, -1): total += arr[j] * math.pow(2, j) print("Decimal number of 1000001 (binary) is %d" % math.floor(total))